Shortpass Filter
Chenyu Optics manufactures custom short pass filters, also written as shortpass filters, according to the required cut-off wavelength, transmission band, blocking range and angle of incidence. Substrate material, filter size, thickness and coating design are reviewed together because achievable transmission and blocking performance depend on the specified wavelength range and optical system.
Shortpass Filter Overview
Shortpass filters, also called short pass filters, transmit wavelengths below a defined cut-off while attenuating longer wavelengths outside the transmission band.
Performance is specified by the cut-off wavelength, transmission range, average transmission, blocking wavelength range, optical density and angle of incidence. Final values depend on wavelength, substrate, filter size and coating design, so they must be confirmed for each requirement.
Chenyu Optics supports custom shortpass filter manufacturing according to customer drawings, including custom substrate materials, dimensions, cut-off wavelengths, thicknesses and coating designs for prototype and repeat production.
Key Advantages of Shortpass Filter
Fluorescence Imaging & UV Imaging Systems
Shortpass filters are widely used for short wavelength isolation in fluorescence imaging systems, UV imaging equipment, machine vision and optical sensing instruments.
Typical Specifications of Shortpass Filter
| Cut-off Wavelength | Custom specification; confirmed according to wavelength and coating design |
|---|---|
| Transmission Range | Available upon request |
| Average Transmission | Confirmed according to the specified wavelength range and design |
| Blocking Wavelength Range | Defined by customer application; available upon request |
| Optical Density | Confirmed according to blocking range and coating design |
| Angle of Incidence | Specified by the customer’s optical system |
| Substrate | Optical glass, N-BK7, fused silica or other specified material; available upon request |
| Size | Available upon request |
| Thickness | Available upon request |
| Operating Temperature | Depends on substrate, coating design and operating environment |
| Inspection Method | Spectral and dimensional inspection according to the agreed specification and available measurement range |
Spectral Transmission Curve (Typical)
Why Choose Chenyu Optics for Shortpass Filter
Chenyu Optics focuses on drawing-based precision filter manufacturing for fluorescence imaging, machine vision, UV imaging and industrial optical systems. We support prototype verification, small-batch production and repeat manufacturing for non-standard shortpass filters.
Manufacturing Capability for Shortpass Filter
Precision Polishing
Surface and dimensional requirements are processed according to the approved drawing and inspection criteria.
Dielectric Coating
Short pass coating design is reviewed according to cut-off wavelength, transmission range, blocking range and angle of incidence.
Inspection & Packaging
Spectral and dimensional inspection follows the agreed requirements and available measurement range, followed by protective packaging.
Custom Shortpass Filter Options
Cutoff Filter Type Comparison
| Filter Type | Cutoff Behavior | Peak Transmission | Blocking (OD) | Typical Applications |
|---|---|---|---|---|
| Shortpass Filter | Transmits short, blocks long | Confirmed according to wavelength and design | Confirmed according to blocking range and design | Fluorescence, UV imaging |
| Longpass Filter | Transmits long, blocks short | Confirmed according to wavelength and design | Confirmed according to blocking range and design | Fluorescence, spectroscopy |
| Dichroic Shortpass Filter | Transmits short, reflects long | Confirmed according to wavelength and design | Confirmed according to blocking range and design | Beam separation, laser systems |
| Bandpass Filter | Transmits selected band only | Confirmed according to wavelength and design | Confirmed according to blocking range and design | Machine vision, instrumentation |
Applications of Shortpass Filter
Fluorescence Imaging Systems
Short wavelength isolation for fluorescence excitation paths.
Machine Vision Systems
Spectral edge control for machine vision and inspection equipment.
UV Imaging Systems
Visible and infrared light rejection for UV-sensitive imaging.
Optical Sensing Systems
Short wavelength selection for optical sensor design.
Laser Measurement Systems
Spectral filtering for laser wavelength measurement instruments.
Spectral Analysis Instruments
Precise cut-off control for spectral analysis and instrumentation.
Shortpass Filter FAQ
What is a shortpass filter used for?
A shortpass filter transmits wavelengths below a defined cut-off while blocking longer wavelengths.
What parameters define a shortpass filter?
Key parameters include cut-off wavelength, transmission band, peak transmission, optical density blocking, and incident angle.
How is a shortpass filter different from a longpass filter?
A shortpass filter transmits shorter wavelengths and blocks longer ones, while a longpass filter does the opposite.
Can shortpass filters be customized for different cut-off wavelengths?
Custom short pass filter requirements can be reviewed for UV, visible or near-infrared wavelengths. Achievable performance depends on the specified band, substrate, size, angle of incidence and coating design.
Does incident angle affect shortpass filter performance?
Yes. The cut-off wavelength can shift with incident angle, so coating design should match the optical setup.
What information should I provide for a quotation?
Please provide cut-off wavelength, transmission band, substrate material, dimensions, angle of incidence, quantity and drawing if available.
Where can I learn more about shortpass filter design?
Additional information on shortpass filter design can be found from Edmund Optics.
Related Products for Shortpass Filter
Need Custom Shortpass Filters?
Send us your cut-off wavelength, transmission band, substrate, dimensions, coating requirements and quantity. Chenyu Optics will review the optical and mechanical specifications and provide a suitable shortpass filter manufacturing suggestion.